Noob question about Seoi Nage/Ippon Seoi Nage

I'm not sure if I should have posted this in Newbietown, but it is a Judo related question, so I deemed it accettable, although it might be a really stupid question.
Is there a difference between Ippon Seoi Nage and Seoi Nage? I tried a search, but I could only find discussions about the difference between Ippon Seoi Nage and Morote Seoi Nage, or Seoi Otoshi... plus a couple threads from Judoforum that my antivirus blocked.

I'm not sure if I should have posted this in Newbietown, but it is a Judo related question, so I deemed it accettable, although it might be a really stupid question.
Is there a difference between Ippon Seoi Nage and Seoi Nage? I tried a search, but I could only find discussions about the difference between Ippon Seoi Nage and Morote Seoi Nage, or Seoi Otoshi... plus a couple threads from Judoforum that my antivirus blocked.

Thanks to all who will take the time to answer.

Ippon Seoi Nage is a one armed shoulder throw, Morote Seoi Nage is a two armed Shoulder Throw, Seoi Otoshi is a dropping shoulder throw

I'll second that, and add seio otoshi seems to be all the rage with the love seoi nage crowd right now, at least around LA. But maybe my subjective experience is totally off base? Be curious to see what everyone else thinks.

I'll second that, and add seio otoshi seems to be all the rage with the love seoi nage crowd right now, at least around LA. But maybe my subjective experience is totally off base? Be curious to see what everyone else thinks.

Up here in the land of ice and snow the seoi enthusiasts don't seem to use the full otoshi, prefering either to keep to the standing seoi nage or droping into the deep lunge version of seoi otoshi instead of the droping to both knees variant.

What Nickosaurus said is correct, that being said when I hear people just say seoi nage 9 times out of 10 they mean ippon seoi nage

Those people would be wrong although it is a common mistake. Seoinage is the standard technique using two hands also called morote seionage, ippon seionage is the variation. Ippon seionage is not in the gokyo no waza (standard techniques), it is in the shinmeisho no waza (new techniques).

Those people would be wrong although it is a common mistake. Seoinage is the standard technique using two hands also called morote seionage, ippon seionage is the variation. Ippon seionage is not in the gokyo no waza (standard techniques), it is in the shinmeisho no waza (new techniques).

2nd that.

"Seionage" is Morote Seionage.

"Ippon Seionage" is the one most commonly seen and that most people think of when they hear Seionage.

That's interesting. Judo is just kind of a side thing for me, don't pay enough attention to the bigger scene to know how much regional difference there is in terms of preference. But I'm sure anyone competing on a national level recognizes it.

Edit: Was replying to Judojeff and the quote button didn't seem to work for some reason.